Expansible pulley.



W., T. W. H. & P. 0. PHILIPSON.

EXPANSIBLE PULLEY.

APPLICATION FILED AUG. 28, 1912.

1,1 12,345. I Patented Sept 29,1914,

. 2 SHEETS-SHEET 1.

W., T. W. H. 6: P. G. PHILIPSON.

' EXPANSIBLE PULLEY.

Patented Sept. 29, 1914.

2 SHEETS-SHEET 2.

' UNITED STATES PATENT oFFIo-E.

WILLIAM PHILIPSON, THOMAS WHITTLE HOPWOOD PHILIPSON, AND PERCY CLARK- SON PHILIPSON, OF BOLTON, ENGLAND.

nxransmnn PULLEY.

Specification of Letters Patent; P t ht ,5 14

Application filed August 28, 1912. Serial No. 716,716.

ton, in the county of Lancaster, England,

have invented a certain new and useful Improvement in Expansible Pulleys, of which the following description, together with the accompanying sheets of drawings, is a specification.

This invention relates to expansible pulleys of the type advantageously employed in Connection with the driving gear of a motor road vehicle, especially when such motor vehicles are of the type known as motorcycles, motor-tricycles, or the like, wherein a flexible driving belt is employed. In connection with thls type of driving gear the driving belt is propelled by the'employment of two disks mounted upon one and the same shaft with their 0 posed surfaces inclined to each other or 0? such formation as will enable the use of the flexible drivin belt of tapering form in cross section, an the object of our invention is a ,novel means of ad usting these disks in position relatively with each other to va the interval between sothat when said dis are in'position nearest to'each other the dri belt engages same nearest their peripheries at.

which time the speed of such driving belt will be at its maximum while when said disks are separated to the greatest extent the driving belt will approach nearest to the center .of their rotation and therefore .the speed of such belt will be at its Many devices have been employed for this purpose but most of them are of complicated character, whereas by the employment of our.

devices such complicated parts areeliminated and few operative parts of comparatively simple construction are substituted.

In. the accompanying-sheets of drawings which are illustrative of our invention:- Figure 1 is a diametrical section of our improved device as arranged in conjunction 'with the bevel faced driving disk for trans- Knitting motion to parts well understood, said disks being shown in close proximity to each other. Fig. 2 'is 'a view showing most of the parts in elevation but -with apart (hereinafter described as a spring box) broken away, the bevel faced dri disks in this case bein shown at their eatest dlstancetapart. i 3 is an and e evation pf the parts shown by F i 1 and 2 as seen in the direction-indicate by the arrow 12 with the end cover of the spring box an other parts removed so that the spring and its connections may be more clearly seen.

brake device is also shown in connection .with this arrangement of devices. Figs. 4 and 5 are side and end elevations respectively in detail of a device that is or maybe employed for holding or looking the movable or screw-operated part in'position as hereinafter described. Fi 6 is a sectional elevation showing a modi cation of certain of the arts shown by Figs. 1 and'2.

In t e type of driving gear herein referred to and as illustratedby the accompanying sheets of drawings, the bevel faced driving disks b and b, transmit motion tothe appropriately shaped driving belt which acts in conjunction with them in manner well known, and on being moved closer together or farther apart move the said belt respectively at a faster or slower speed as is well understood, and as the adjustment of these disks b, b at a greater or less distance apart is the peculiar function of our mechanical device we have illustrated same in conjunction with these disks 6 and 6 In doing this it will be observed that the mam driving shaft 0 has the disk I) securely fixed u on it and this disk 6 has a sleeve 2 which extendsbeyond said shaft 0 so, that we mount thereon the disk 6 which has a sleeve 3 embracing the sleeve 2 formed on the disk I). The sleeve 3 is provided with a key way to accommodate a keyd secured to the sleeve 2, so that at all times the rotary motion of theshaft c as transmitted to the disk b will throughthe key 4 be transmitted to the disk 6, while at the same time disk, b

and its sleeve 3 may be slidably moved upon transmitted to the disk I) said disk I) ma be moved lengthwise of the shaft c.

TOnthe outer end of the sleeve 3 are formed screw threads 6which mesh with the screw threads 5" formed within the sleeve 05 of "a sprin has mounted terein a spiral recoil spring 7 which has its outer end secured thereb engaging the notch f as shown by Flg. 3, while its inner end engages over the hook g of the hoop g. The hoop g embraces the outer end of the sleeve 2 and isreta'ined thereon by the threaded sleeve h of the nut -h which forces the projection 70 of the washer is into the notches g in said hoop 9 so that the rotary motion of the shaft 0 is transmitted through the disk 6 and its sleeve"2 to this hoop g continuously. The plate k may also be rotated to adjust the tensionof the spring a fUpon the peripheral surface of the spring box d a suitable brake lever or band we is made to apply so that the user may by manipulating the pedal end of said brake ever m force said brakeinto contact with the periphery ofsaid spring box at against the tension while the spring n will normallj keep' said brake lever m clear of said box The action of the foregoing parts is as follows: Assuming that the driving shaft. 0 is being continuously driven and that it is desired toreduce the speed of the motion transmitted by the driving disks 6, 6 re.- volving with same, such reduction of speed can'be eifected by moving the disk 6 away from the disk 6 as, say from the position shown by Fig. 1 toward the position shown by Fig. 2 and to effect this it is only necessary to retard the motion of the spring box dby pressing upon the brake lever m so that instead of said spring box being rotated at the same speed as are the disks 1;, 6 its rotary motion is retarded, and by this retardation the spring within the box a? is wound up and at the same time the action of the screw threads 5 in the sleeve d acting upon the screw threads 6 on the sleeve 3, moves said sleeve 3 and its disk I) along the sleeve2 whereby the disk I) recedes from th'edisk b as desired. p

On releasing pressure upon the brake lever m the retracting spring n will remove samefrom contact with the spring, box (1 a and permit the recoil spring to rotate said box (1 to cause its screw t read '5 to act ulpon the screw thread 6. and thereby move t e sleeve 3 and the disk 6 back. to their normal ositions adjacent to the disk 6 Thus it W1 1 be seen that in addition to the ordinary'rotary. motion that is transmitted to the disk b from the*shaft c said disk 6 has b the aeceleratedor retarded rotation of e spring, box'and screw motion transmitted to it lengthwise said shaft 0. Under'some conditions it is desirable that thespring boxd should be capable of being lockedin any adjusted positionrelative to box d.- This spring-box d the disk 6. For such purpose an arm as k is provided (see Fig. 4) extended from the washer is so that a detent k may be mounted thereon to engage with ratchet teeth d 5 formed on the periphery of the spring box 03. It will be seen that such ratchet will hold said spring box d in such-position relatively with the disk I) as may be found desirable. When the disks b and b are so far separated as to permit the. driving belt to engage upon the periphery of the sleeve 2,

said sleeve may have a rotary annular collar aznnounted thereon as shown ,by Fig. 6 free to move upon said sleeve 2 by which means although the disks 1) and b and their respective sleeves'may be continuously rotating, driving belt and the annular collar will remain stationary.

We claim:

1. An expansible pulley embodying opposed inclined disks, one of which is axially movable relative to the other; means to rotate said disks in unison; an independently rotatable part; means to retard the movement of the independently rotatable part; means to accelerate the movement of the independently movable part when the retarding means is released; and means whereby the retarded and accelerated movements of the movable part move the movable disk longitudinally.

2. An expansible pulley embodying opposed inclined disks mounted to rotate, one ofsaid disks being movable in parallelism with the aXis' of rotation; a part rotatable independently of the disks; threaded connection between the independently rotatable part and the movable disk whereby a difference in rotation of the independently rotatable part causes a movement of the disk; manual means for retarding the movement of the independently rotatable part; and mechanical means for accelerating the movement of the independently rotatable part when the manual retarding means is released.

3. In an expansible pulley opposed inclined disks, one of which is movable in parallelism with the axis of rotation; a collar capable of normal rotation with the disks and of independent rotation relative thereto; means whereby independent rotationof-the collar causes movement of the movable disk; at sprin connected with the collar; manual means for retarding the collarand placing the-sprin under greater tension; and means to with raw the retarding means to permit the spring to accelerate independentl movable part causes movement of the isk; manna means for retarding the movement of the independently movable part; means for locking the independently movable part when so retarded; and means to accelerate. the movement of the independently movable part when the locking and retarding means are released.

In testimony whereof we have signed our names to this specification in the presence of 10 two subscribing witnesses.

WILLIAM PHILIPSON. I THOMAS WHITTLE H01WO0D PHILIPSON. vPERCY GLARKSON PHILIPSON.

Witnesses J 01m Wm'mmmn, N. GREENWOOD. 

